Approximately how much work do you do when you lift your 10.0 kg sister to a height of 1.5 m?

Answer:

∆p=(m2v)kg.m/s

Explanation:

∆p=mv where v=2v. hence ∆p=m2v

Answer:

c. 2p

Explanation:

edge 2021

a) The net force acting on the box is 181 N at an angle of 17.3 degrees below the horizontal.

b) The box will have been pushed 2.26 m assuming the force is constant.

a) To find the net force, we need to resolve the applied force vector into horizontal and vertical components. The horizontal component is 225cos(27.0) = 196 N and the vertical component is 225sin(27.0) = 102 N. The frictional force acts in the opposite direction to the horizontal component, so the net force in the horizontal direction is 196 - 44 = 152 N.

The net force in the vertical direction is 102 N - 750 N (weight of the box) = -648 N. Using the Pythagorean theorem, the magnitude of the net force is sqrt((152 N)² + (-648 N)²) = 670 N. The angle between the net force and the horizontal is arctan(-648 N/152 N) = -17.3 degrees below the horizontal.

b) We can use the kinematic equation d = 1/2at² to find the distance the box travels in 5.00 s, where a is the acceleration of the box and t is the time. The net force in the horizontal direction is responsible for the acceleration of the box, so we can use F = ma to find the acceleration: a = F/m = 152 N/75.0 kg = 2.03 m/s².

Substituting into the kinematic equation, we get d = 1/2 * 2.03 m/s² * (5.00 s)² = 25.3 m. However, this assumes that the force is constant, which may not be true in reality.

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In component form, the displacement vectors become

• 350 m [S]   ==>   (0, -350) m

• 400 m [E 20° N]   ==>   (400 cos(20°), 400 sin(20°)) m

(which I interpret to mean 20° north of east]

• 550 m [N 10° W]   ==>   (550 cos(100°), 550 sin(100°)) m

Then the student's total displacement is the sum of these:

(0 + 400 cos(20°) + 550 cos(100°), -350 + 400 sin(20°) + 550 sin(100°)) m

≈ (280.371, 328.452) m

which leaves the student a distance of about 431.8 m from their starting point in a direction of around arctan(328.452/280.371) ≈ 50° from the horizontal, i.e. approximately 431.8 m [E 50° N].

Answer:

I. Angle = 41.7° Northeast.

II. Vr = 7.08m/s

Explanation:

Let the two cars be denoted by A and B

Given the following data;

Mass of car A = 1232 Kg

Velocity of car A = 25.6 m/s

Mass of car B = 2028 Kg

Velocity of car B = 17.5m/s

First of all, we would solve for momentum;

Momentum = mass × velocity

Momentum, M1 = 1232 × 25.6

Momentum, M1 = 31539.2 Kgm/s

Momentum, M2 = 2028 × 17.5

Momentum, M2 = 35490 Kgm/s

Now, let's find the resultant momentum using the Pythagoras theorem;

R² = M1² + M2²

R² = 31539.2² + 35490²

R² = 994721136.6 + 1259540100

R² = 2254261237

Taking the square root of both sides, we have

Resultant momentum, R = 47479.06 Kgm/s

To find the direction;

Angle = tan¯¹(M1/M2)

Angle = tan¯¹(31539.2/35490)

Angle = tan¯¹(0.89)

Angle = 41.7° Northeast.

To find the speed;

R = (M1 + M2)Vr

47479.06 = (31539.2 + 35490)Vr

47479.06 = 67029.2Vr

Vr = 47479.06/67029.2

Vr = 7.08m/s

Answer:water

Explanation:

Answer: The spinning of Earth's outer core causes the lithosphere to break into individual plates and collide with each other.

Earth's surface forms because of this reason:

The spinning of Earth's outer core causes the lithosphere to break into individual plates and collide with each other.

Generally, the coefficient of static friction should be at least 0.7 for a car traveling at this speed, but this value could be higher depending on the specific conditions.

The coefficient of static friction, or μs, is the ratio of the maximum static force that can be applied without causing slipping to the normal force between two surfaces. The coefficient is affected by the surfaces in contact and the material they are made of.

The tires of a car also have an effect on the coefficient of static friction. Tires with a greater tread depth can provide better grip on the road and therefore have a higher coefficient of static friction than tires with a shallow tread. Tire pressure also plays a role, as low pressure can reduce the coefficient of static friction.

The weight of the vehicle is also an important factor. Heavier vehicles tend to have a higher coefficient of static friction, as the greater mass increases the normal force between the car and the surface.

In conclusion, the coefficient of static friction for a car traveling at 115 km/h around a turn depends on several factors, including the road surface, the vehicle's tires, and the vehicle's weight.

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If you measure the average brightness and pulsation period of a cepheid variable star, you can also determine its distance.

Cepheid variable stars belong to a class of stars that have a distinct relationship between variation period and luminosity.

Their period of cycle and luminosity are closely related to each other and they differ in temperature and diameter.

As their brightness increases and decreases, therefore, it helps out in the measurement of intergalactic and interstellar distances.

The changes in amplitude of their motion and cycle period have a definite impact on their brightness which enables us to determine their distance.

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Answer:

Benjamin Franklin

Explanation:

sorry if wrong.

I don't know who it is surely.

Explanation:

the light contributes to the changing seasons because the shorter the day it is most likely winter or fall and the longer the day it is most likely summer or spring

Melanie is walking through a field looking at the flowers. She sees some that are yellow and others that are white. The color that she is seeing is referred to the hue that is determined by the light's wavelength.

Hue represents the color being displayed, as found on a red-green-blue scale, color wheel or grayscale. The intensity of the primary colors or gray displayed grows with increased brightness, but the color itself does not change. Changing to different color values makes no difference. It is like changing the brightness of a light bulb that sits behind a transparent piece of plastic with a specific color. As the voltage in the light bulb increases, the light intensity increases, but the color or hue remains unchanged.

So, Melanie is walking through a field looking at the flowers. She sees some that are yellow and others that are white. The color that she is seeing is referred to the hue that is determined by the light's wavelength.

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The magnitude of the electric field at the midpoint between the two charged rings is zero.

The magnitude of the electric field at the midpoint between two charged rings can be calculated using the principle of superposition.

The electric field at the midpoint will be the sum of the electric fields produced by each ring individually. Since the charges on the rings are equal in magnitude and opposite in sign, the electric fields produced by each ring will have the same magnitude but point in opposite directions.

The electric field produced by a uniformly charged ring at a point on its axis can be calculated using the formula:

\(E = (k * Q * x) / (2 * π * ε * R^2 * (R^2 + x^2)^(3/2))\)

Where:

E is the electric field

k is Coulomb's constant\((8.99 x 10^9 N m^2/C^2)\)

Q is the charge on the ring

x is the distance from the center of the ring to the point on its axis

ε is the permittivity of free space \((8.85 x 10^-12 C^2/N m^2)\)

R is the radius of the ring

Since the rings have the same charge and are equidistant from the midpoint, the electric fields produced by each ring will cancel each other out, resulting in a net electric field of zero at the midpoint. Therefore, the magnitude of the electric field at the midpoint between the two charged rings is zero.

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The objective lens is a long focal length, convex lens and the eyepiece functions as a simple magnifier is the correct statement about a compound microscope. Option b is correct.

In a compound microscope, the objective lens is a long focal length, convex lens that produces an inverted, magnified real image of the specimen. The eyepiece, on the other hand, functions as a simple magnifier, which further magnifies the real image produced by the objective lens and forms a virtual image that can be viewed by the observer's eye. Therefore, option b is the correct statement.

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--The complete question is, A compound microscope is a two-lens system used to look at very small objects. Which of the following statements is correct?

a. The objective lens is a short focal length, convex lens and the eyepiece functions as a simple magnifier.

b. The objective lens is a long focal length, convex lens and the eyepiece functions as a simple magnifier.

c.  The objective lens and the eyepiece both have the same focal length and both serve as simple magnifiers.--

The statement that is true concerning a substance with high specific heat is as follows: the substance cools down slowly after heating. an example substance is aluminum metal (option A)

Specific heat or specific heat capacity refers to the heat capacity per unit mass of a pure substance.

In other words, specific heat is defined as the amount of heat needed to increase the temperature of 1kg of a material by 1K and is expressed in terms of J/kg·K or equivalently J/kg·°C.

The specific heat capacity of a material is a physical property. It is also an example of an extensive property since its value is proportional to size.

Water is an example of a substance that has an extremely high specific heat capacity, which makes it good for temperature regulation.

Therefore, a substance with high specific heat cools down slowly after heating and an example is aluminum metal.

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Answer:

According to newtons first law of motion an object remains in its state of rest or motion in a straight line unless an external unbalanced forces acts upon it. This is the reason why Newtons first law of motion is often called the LAW OF INERTIA

Answer: Conduction occurs more readily in solids and liquids, where the particles are closer to together, than in gases, where particles are further apart.

Answer:

conduction occurs when gas becomes liquid.

The speed of the projectile when it strikes the ground below is approximately 620.6 m/s.

We can use the kinematic equations of motion to solve this problem.

First, we can find the time it takes for the projectile to hit the ground using the vertical motion equation:

y = vi*t + (1/2)at²

where y is the vertical displacement (in this case, the initial height of the cliff), vi is the initial vertical velocity (in this case, zero), a is the acceleration due to gravity (-9.8 m/s^2), and t is time.

Plugging in the values, we get:

265 m = 0t + (1/2)(-9.8 m/s²)*t²

Solving for t, we get:

t = √((2*265 m) / (9.8 m/s²)) = 8.25 s

Next, we can find the horizontal displacement of the projectile using the horizontal motion equation:

x = v*t

where x is the horizontal displacement, v is the initial horizontal velocity, and t is time.

Since the initial velocity is at a 45-degree angle, we can break it down into its horizontal and vertical components:

v_initial_x = v_initial*cos(45 degrees) = 350 m/s * cos(45 degrees) = 247.5 m/s

v_initial_y = v_initial*sin(45 degrees) = 350 m/s * sin(45 degrees) = 247.5 m/s

The horizontal displacement can now be calculated as:

x = v_initial_x * t = 247.5 m/s * 8.25 s = 2041.9 m

Finally, we can find the speed of the projectile when it hits the ground using the total velocity equation:

v_final² = v_initial_x² + v_initial_y² + 2ay

where v_final is the final velocity, v_initial_x and v_initial_y are the horizontal and vertical components of the initial velocity, and y is the vertical displacement.

Plugging in the values, we get:

v_final² = (247.5 m/s)² + (350 m/s)² + 2*(-9.8 m/s²)*(265 m)

Solving for v_final, we get:

v_final = √((247.5 m/s)² + (350 m/s)² + 2*(-9.8 m/s²)*(265 m)) = 620.6 m/s

Therefore, the speed of the projectile when it strikes the ground below is approximately 620.6 m/s.

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Answer:

There are several ways to consider the composition of the human body, including the elements, type of molecule, or type of cells. Most of the human body is made up of water and H2O, with bone cells being comprised of 31% water and the lungs 83%.1  Therefore, it isn't surprising that most of the human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 96.2% of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen, and nitrogen.

Explanation:

Elements are essential units that are the basic constituents of all living and non-living beings. They are the core of the universe. Every tiny or huge particle comprises elements. Our body is built up of five major elements: Carbon, Hydrogen, Oxygen, Nitrogen and calcium.

In the circuit, the total current is 60 A and the voltage is 240 V. If R1

resistance is 20 Ω, then the R2 resistance  would be 5 Ω

Resistance is the obstruction of electrons in an electrically conducting material. The SI unit of the resistance is Ohm

The mathematical relation for resistance can be understood with the help of the empirical relation provided by Ohm's law.

V=IR

where V is the voltage

I is the current

R is the resistance

For the given problem V= 240 V and I = 60 A

R = V/I

R =240/60

R =4 Ω

For calculating equivalent resistance in parallel combination.

1/Re = 1/R1  + 1/R2

1/4 = 1/20 +  1/R2

R2 = 5 Ω

Thus , the R2 resistance would be 5 Ω, therefore the correct answer is option B.

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To find the current in the resistor, we can use Ohm's Law and the concept of equivalent resistance. Thus, option A is correct.

First, let's calculate the equivalent resistance of the three cells connected in parallel. When resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances:

1/Req = 1/R1 + 1/R2 + 1/R3

Given that R1 = R2 = R3 = 22 Ω (internal resistance of each cell), we can substitute the values:

1/Req = 1/22 + 1/22 + 1/22

1/Req = 3/22

Taking the reciprocal of both sides, we find:

Req = 22/3 Ω

Now we can use Ohm's Law to calculate the current (I) in the resistor. Ohm's Law states that the current flowing through a resistor is equal to the voltage across it divided by its resistance:

I = V/R

Given that V = 1.1 V (emf of each cell) and R = 32 Ω (resistance), we can substitute the values:

I = 1.1/32

Calculating this value, we find:

I ≈ 0.034375 A

Therefore, the current in the resistor is approximately 0.034375 A.

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i. The elasticity at point \( g \) is the measure of responsiveness or sensitivity of a quantity to changes in another variable at point \( g \).

ii. To determine the elasticity at point \( h \), we first need to establish what quantity we are referring to at point \( h \). Once we have identified the relevant quantity, we can then calculate its elasticity by measuring the responsiveness or sensitivity to changes in another variable at point \( h \).

i. To determine the elasticity at point \( g \), we need specific information about the variables and their relationship. Elasticity is typically calculated as the percentage change in one variable divided by the percentage change in another variable.

ii. Without additional information about the specific variables and their relationship at point \( h \), it is difficult to provide a precise answer. The concept of elasticity requires specific context and variables to be defined in order to calculate or describe it accurately.

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The maximum speed the mass have before the string breaks is 7.835 m/s.

This question involves the the application of multiple concepts like tension, weight, and centripetal force.

First step will be, to find the maximum tension force:

Tension = Weight

T = W = mg = (19.2 kg)(9.81 m/s²)

T = 188.352 N

Now, this tension force must be equal to the the value of the centripetal force:

\(T=\frac{mv^{2} }{r}\\ v=\sqrt{\frac{Tr}{m} }\)

where,

v = maximum speed = ?

r = radius = 1.18 m

m = mass = 3.62 kg

Therefore,

\(v=\sqrt{\frac{(188.352)(1.18)}{3.62} }\)

v=7.835 m/s

A centripetal force is the force which is made up of two Latin words centrum which means center and the petel which means to seek.

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Answer:

Solar panels

sun light into electricity

They are maintaining their body temperature by cooling down, like dogs do, as they don't have enough sweat glands to keep them cool without panting.

Brown bears maintain body temperature by cooling as a result of panting. So, the correct option is D.

Normal human body-temperature is defined as the typical temperature range found in humans which is commonly referred to as 36.5–37.5 °C. The human body temperature varies. Temperature is known as the degree of hotness or coldness of an area or object.

When we are very hot, the blood vessels of the skin dilate to carry the excess heat to the surface of the skin. Brown bear panting ensures that cool air circulates over the moist surfaces in the mouth which helps maintain body temperature by cooling the body.

Therefore, the correct option is D.

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The kinematics allows to find that the result, which happens with the passengers who look back in a punt, is:

Kinematics studies the motion of bodies, finding relationships between position, velocity and acceleration, let's use the relationship

                  v = v₀ + a t

Where v is the velocity, v₀ the initial velocity, at the acceleration and t the time

In this case, as it comes out of rest, the initial velocity is zero.

                   a =\(\frac{v}{t}\)  

Let's reduce  

                v = 200 mph (\(\frac{5280 ft}{1 mi}\)) (\(\frac{1h}{3600 s}\) ) = 293.33 ft / s

Let's calculate

                    a = 293.33 / 1.5

                    a = 195.56 ft / s²

Let's find the relationship of this acceleration and the gravity acceleration.  

           a / g = 195.56 / 9.8

           a = 20 g

The human body loses consciousness for acceleration greater than 6g and cannot move for acceleration much less than 4g, without special suits.

As the acceleration of the plane is very fast, people do not have the strength to stop their feet, so they have to be held, the garlic is held by the eyelids, but the force is felt on them, in some cases some small ones are broken veins.

In conclusion with the kinematics we can find that the result, which happens with the passengers who look back in a clearance is:

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Answer:

position 3

Explanation:

in position 3 PE is least as height is least

so KE is most as energy is always conserved

I believe the answer is C, but im not sure.

Explanation:

Answer:

its vertical component of its velocity is zero

Explanation:

Answer:

in the opposite direction of the force

Answer:

The force applied moves the object in the direction of the force. Suppose if the force is applied to the moving object in that case object moves in the direction of the stronger force. Thus, according to the given question the applied force moves the object in its direction.

that means it's the 2nd option( in the opposite direction of the force